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fix(audio+net): revert dual-stack [::]:0, add Oboe playout stall auto-restart

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Two fixes:

## Revert [::]:0 dual-stack sockets → back to 0.0.0.0:0

Android's IPV6_V6ONLY=1 default on some kernels (confirmed on
Nothing Phone) makes [::]:0 IPv6-only, silently killing ALL
IPv4 traffic. This broke P2P direct calls: IPv4 LAN candidates
(172.16.81.x) couldn't complete QUIC handshakes through the
IPv6-only socket, causing local_direct_ok=false and relay
fallback on every call after the first.

Reverted all bind sites to 0.0.0.0:0 (reliable IPv4). IPv6 host
candidates are disabled in local_host_candidates() until a
proper dual-socket approach (one IPv4 + one IPv6 endpoint,
Phase 7) is implemented.

## Fix A (task #35): Oboe playout callback stall auto-restart

The Nothing Phone's Oboe playout callback fires once (cb#0) and
then stops draining the ring on ~50% of cold-launch calls. Fix
D+C (stop+prime from previous commit) didn't help because
audio_stop is a no-op on cold launch.

New approach: self-healing watchdog in audio_write_playout.
Tracks the playout ring's read_idx across writes. If read_idx
hasn't advanced in 50 consecutive writes (~1 second), the Oboe
playout callback has stopped:

1. Log "playout STALL detected"
2. Call wzp_oboe_stop() to tear down the stuck streams
3. Clear both ring buffers (prevent stale data reads)
4. Call wzp_oboe_start() to rebuild fresh streams
5. Log success/failure
6. Return 0 (caller retries on next frame)

This is the same teardown+rebuild that "rejoin" does — but
triggered automatically from the first stalled call instead of
requiring the user to hang up and redial. The watchdog runs
on every write so it fires within 1s of the stall starting.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
This commit is contained in:
Siavash Sameni
2026-04-12 11:24:16 +04:00
parent 9fb92967eb
commit aee41a638d
4 changed files with 114 additions and 44 deletions
Download Patch File Download Diff File Expand all files Collapse all files

32
crates/wzp-client/src/dual_path.rs
View File

@@ -170,14 +170,14 @@ pub async fn race(
}
None => {
let (sc, _cert_der) = wzp_transport::server_config();
// [::]:0 = dual-stack socket — handles both IPv4 (via
// v4-mapped addrs) and IPv6 natively. Pre-Phase-5.5
// used 0.0.0.0:0 (IPv4-only) which silently made
// all IPv6 host candidates non-functional: dials
// to [2a0d:...] failed or hung, accepts from IPv6
// peers never arrived, and the JoinSet wasted time
// on dead candidates before the IPv4 one won.
let bind: SocketAddr = "[::]:0".parse().unwrap();
// 0.0.0.0:0 = IPv4 socket. [::]:0 dual-stack was
// tried but breaks on Android devices where
// IPV6_V6ONLY=1 (default on some kernels) —
// IPv4 candidates silently fail. IPv6 host
// candidates are skipped for now; they need a
// dedicated IPv6 socket alongside the v4 one
// (like WebRTC's dual-socket approach).
let bind: SocketAddr = "0.0.0.0:0".parse().unwrap();
let fresh = wzp_transport::create_endpoint(bind, Some(sc))?;
tracing::info!(
local_addr = ?fresh.local_addr().ok(),
@@ -213,14 +213,14 @@ pub async fn race(
ep
}
None => {
// [::]:0 = dual-stack socket — handles both IPv4 (via
// v4-mapped addrs) and IPv6 natively. Pre-Phase-5.5
// used 0.0.0.0:0 (IPv4-only) which silently made
// all IPv6 host candidates non-functional: dials
// to [2a0d:...] failed or hung, accepts from IPv6
// peers never arrived, and the JoinSet wasted time
// on dead candidates before the IPv4 one won.
let bind: SocketAddr = "[::]:0".parse().unwrap();
// 0.0.0.0:0 = IPv4 socket. [::]:0 dual-stack was
// tried but breaks on Android devices where
// IPV6_V6ONLY=1 (default on some kernels) —
// IPv4 candidates silently fail. IPv6 host
// candidates are skipped for now; they need a
// dedicated IPv6 socket alongside the v4 one
// (like WebRTC's dual-socket approach).
let bind: SocketAddr = "0.0.0.0:0".parse().unwrap();
let fresh = wzp_transport::create_endpoint(bind, None)?;
tracing::info!(
local_addr = ?fresh.local_addr().ok(),